CVE-2026-9834
WP Database Backup <= 7.11 - Authenticated (Administrator+) OS Command Injection via 'wp_db_exclude_table' Parameter
- Published
- Updated
- Reserved
- Assigned by
- Wordfence
Description
The WP Database Backup – Unlimited Database & Files Backup by Backup for WP plugin for WordPress is vulnerable to OS Command Injection in all versions up to and including 7.11 via the `wp_db_exclude_table` parameter. This is due to the direct concatenation of user-supplied `$_POST['wp_db_exclude_table']` values into the `mysqldump` shell command string in the `mysqldump()` function of `includes/admin/class-wpdb-admin.php` without wrapping them in `escapeshellarg()`—every other argument in the same command (DB_USER, DB_PASSWORD, host, filename, DB_NAME) is properly escaped, making the exclude-table values the sole exception—and because the only applied filtering, `sanitize_text_field()` via `recursive_sanitize_text_field()`, strips HTML tags but leaves shell metacharacters such as `;`, `|`, `` ` ``, and `$()` intact. This makes it possible for authenticated attackers, with administrator-level access and above, to execute arbitrary operating system commands on the server, potentially enabling full remote code execution. The injection is stored: malicious values submitted through the plugin settings form are persisted to the WordPress options table via `update_option('wp_db_exclude_table')` and later retrieved with `get_option()` and passed unsanitized to `shell_exec()` whenever a backup operation runs.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.7% · top 14% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Weakness
Affected products
References (8)
- https://www.wordfence.com/threat-intel/vulnerabilities/id/0a97a217-b00b-4268-a472-8d62ae1d18e3?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpdb-admin.php#L2644 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpdb-admin.php#L2654 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.11/includes/admin/class-wpdb-admin.php#L216 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpdb-admin.php#L2644 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpdb-admin.php#L2654 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/wp-database-backup/tags/7.10/includes/admin/class-wpdb-admin.php#L216 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3574273%40wp-database-backup&new=3574273%40wp-database-backup&sfp_email=&sfph_mail= (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-9834)Record last updated .